[muawiyah]

Spain had been predominantly "Arian Christian" prior to the Moslem invasion(s) (to be technically correct). Now you may or may not consider the Arians who ruled Spain to have been real Christians or not ~ last time I looked the Roman church didn't accept the legitimacy of their baptisms, but there may have been exceptions.

What I think we need here is someone who knows the details of Ecclesiastical and Theological history in Spain circa 350 to 750 to enable us to address this issue of whether or not Islam is pre-Christian, or post-Christian when it comes to Spain.

[BarbaricGrandeur]

Spain had been predominantly "Arian Christian" prior to the Moslem invasion(s) (to be technically correct).

To be "technically correct" Spain had been largely Catholic with an Arian aristocracy (the Goths), who nevertheless eventually adopted the faith of their peasants (before the moors showed up). The Goths had been evangelized by Arians, but to what degree they were attached to the particular dogmas of Arianism is hard to say.

[combat_boots]

The Arian-Athanasian controversy gave fire to the Eastern-Western split in orthodoxy, as well as the fight over whether to display faces in Christian art. The end of it, the Council of Nicea, which was held in the 500s IIRC, came up with the Nicean creed as we know it now.

I am certain you know this.

However, those who were declared heretical in Roman Catholicism didn't necessarily end up so in Byzantine/Eastern Orthodoxy.